Re: [9fans] rc

[David Gordon Hogan <dhog@plan9.bell-labs.com>]

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The following experiment, hopefully, provides further
insight into how the expression is parsed by rc, and how
adding a caret fixes the problem:

dhog% a=(alice bob)
dhog% fn f { echo $a(1)/ }
dhog% fn g { echo $a(1)^/ }
dhog% f
alice /
dhog% g
alice/
dhog% whatis f
fn f {echo $a(1) /}
dhog% whatis g
fn g {echo $a(1)^/}

Observe how rc does not insert a free caret into "$a(1)/".
Instead, the slash starts a new word.  I'm a little suprised
by that; I think I'd prefer a syntax error.


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From: Alexander Viro <viro@math.psu.edu>
To: 9fans@cse.psu.edu
Cc: 9fans@nx.aichi-u.ac.jp
Subject: Re: [9fans] rc
Date: Sat, 12 Jan 2002 22:37:22 -0500 (EST)
Message-ID: <Pine.GSO.4.21.0201122236100.24774-100000@weyl.math.psu.edu>



On Sun, 13 Jan 2002 arisawa@ar.aichi-u.ac.jp wrote:

> Hello,
>
> The following result is curious for me.
>
> term% a=(alice bob)
> term% echo $a(1)/
> alice /
> term% b=$a(1)
> term% echo $b/
> alice/
>
> Is this a specification or bug?

The former.  See the rules for implicit ^ insertion.